i dont have a spec for a 75 hp plate system. according to one of my books, the 100 hp is N2O .047 FUEL .053. it seems that every .008 size larger on the N2O is worth 25 hp. the fuel is not so consistent. be careful with that. sorry i cant be more help._________________

Nitrous has to operate at about 900 to 950 psi at 85° F in the bottle (bigger bottles are used not because you can burn more NOS but to keep the system pressure stable). You will need at least 93 octane fuel to run up to 100 horse of NOS. Anything beyond that and I recommend a fuel cell filled with 100+ octane fuel just for the NOS system. Remember the power comes from the fuel not the NOS so you have to have enough fuel to cover your NOS shot or it will find something else to burn (like pistons). Your fuel pump and fuel lines have to be up to the task (volume and pressure must be adequate. As to jet sizes (measured in thousands of an inch) they are listed on Holley’s Tech Support site as follows:

Spark plugs shouldn’t have more than a 0.035" gap (most modern car engines run projected nose plugs with gaps of 0.060") so you will need a reduced nose plug in the correct heat range for your motor to keep out of detonation. To be safe pull out two degrees of ignition advance for every 100 horse of NOS.

Nitrous has to operate at about 900 to 950 psi at 85° F in the bottle (bigger bottles are used not because you can burn more NOS but to keep the system pressure stable). You will need at least 93 octane fuel to run up to 100 horse of NOS. Anything beyond that and I recommend a fuel cell filled with 100+ octane fuel just for the NOS system. Remember the power comes from the fuel not the NOS so you have to have enough fuel to cover your NOS shot or it will find something else to burn (like pistons). Your fuel pump and fuel lines have to be up to the task (volume and pressure must be adequate. As to jet sizes (measured in thousands of an inch) they are listed on Holley’s Tech Support site as follows:

Spark plugs shouldn’t have more than a 0.035" gap (most modern car engines run projected nose plugs with gaps of 0.060") so you will need a reduced nose plug in the correct heat range for your motor to keep out of detonation. To be safe pull out two degrees of ignition advance for every 100 horse of NOS.

Big Dave

What is the fuel pressure for those tune ups.NOS tuneups are different._________________FORD POWER RULES DEATH TO ALL CHEVYS.

"BAKER"
10/5/50-11/7/06

"She doesn't seem to be breathing right,it might be the jets."-The Mechanic

I remembered something I had that may be useful. However is a pdf file and I'll need some help getting in somewhere everybody can see it. I found it about a year ago and I have no clue where I found it or what the link is. HELP!!! Clay

The fuel side is always 4 - 6 jet sizes above the nitrous side for my kit
Fuel pressure for the system is supposed to be between 6.5 and 7 psi and bottle pressure between 900 and 950 psi
Timing needs to be retarded by 2 degrees for every 50 HP

What alot of people don't realize to is that the fuel pressure is suposed to be set under flowing conditions and measured after the soleniod. When you start getting close on the tune a 1/10 of pound means alot.

Bam_________________Take the horse out off the barn and let her RUN BABY RUN!!!!!

What alot of people don't realize to is that the fuel pressure is suposed to be set under flowing conditions and measured after the soleniod. When you start getting close on the tune a 1/10 of pound means alot.

Bam

Very true!! I have a hose that I connect to the connector that is connected to the fuel solenoid. At the end of that hose I have a fitting that will accept nitrous jets. I install the nitrous jet that I'm running and then turn on the fuel pump and let the fuel flow into a container while I set the fuel pressure. I always use the fuel jet for the shot that I'm running.. So, if it's a 100 shot, I flow the fuel for the 63 jet, for the 150 with the 75 jet etc. etc..

Here is some useful links for the first one you have to do the math to get inches for the jet sizes. The second one just enter the jet size and fuel pressure which is important to get the rest of the story quite nice!

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